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Related Concept Videos

Thermal Strain01:19

Thermal Strain

2.7K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

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San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...
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Measurements of Strain01:27

Measurements of Strain

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Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

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The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
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Thermal Stress01:09

Thermal Stress

3.2K
If the temperature of an object is changed while it is prevented from expanding or contracting, the object is subjected to stress. The stress is compressive if the object expands in the absence of constraint and tensile if it contracts. This stress resulting from temperature change is known as thermal stress. It can be quite large and can cause damage. To avoid this stress, engineers may design components so they can expand and contract freely. For instance, on highways, gaps are deliberately...
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Thermally Stable Wireless Patch Antenna Sensor for Strain and Crack Sensing.

Dan Li1, Yang Wang1,2

  • 1School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30301, USA.

Sensors (Basel, Switzerland)
|July 15, 2020
PubMed
Summary

New patch antenna sensors offer reliable wireless strain and crack detection for structural health monitoring (SHM). These improved sensors overcome temperature interference and extend interrogation distance for better structural safety assessments.

Keywords:
RFIDcrackenergy harvestingpatch antenna sensorstrainthermal stabilitywireless sensing

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Area of Science:

  • Engineering
  • Materials Science
  • Electrical Engineering

Background:

  • Structural safety relies on monitoring strain and cracks.
  • Patch antenna sensors offer wireless strain and crack estimation via resonance frequency shifts.
  • Existing sensors face challenges from temperature fluctuations and limited interrogation distances.

Purpose of the Study:

  • To develop thermally stable patch antenna sensors for reliable structural health monitoring (SHM).
  • To enhance sensor reliability by mitigating temperature-induced frequency shifts.
  • To improve interrogation distance for practical SHM applications.

Main Methods:

  • Designed and fabricated passive (battery-free) patch antenna sensors on substrates with stable dielectric constants.
  • Developed a dual-mode patch antenna sensor to achieve longer interrogation distances.
  • Conducted experimental characterization including thermal stability, tensile strain sensing, and crack sensing.

Main Results:

  • The new passive patch antenna sensor demonstrated improved reliability under temperature fluctuations.
  • The dual-mode patch antenna sensor achieved a longer interrogation distance.
  • Both sensor designs proved effective for wireless strain and crack measurements.

Conclusions:

  • Thermally stable and long-range patch antenna sensors are viable for wireless structural health monitoring.
  • These novel sensors enhance the reliability and practicality of detecting structural strain and cracks.
  • The developed sensors show significant potential for advancing structural safety assessments.